Method for damping vibrations which is chiefly applicable to blowpipe apparatus for the cutting of metals, and apparatus wherein the said method is carried into effect



April 21, 1931. M, CLAUDE 1,802,237

METHOD FOR DAMPINC VIERATIoNs WHICH IS CHIEFLY APPLICABLE TO BLOWPIPE APPARATUS FOR THE CUTTING OF METALS AND APPARATUS WHEREIN THE SAID METHOD Is CARRIED INTO EFFECT Original Filed Sept. 6, 1927 Patented Apr. 21, 1931 I UNITED STATES PATENT OFFICE MAURICE CLAUDE, BOULOGNE-SUR-SEINE, FRANCE METHOD FOR DAMPING VIBRATIONS' WHICH IS GHIEFLY APPLICABLE TO BLOWPIPE APPARATUS FOR THE CUTTING 0F METALS, AND APPARATUS WHEREIN THE SAID METHOD IS CARRIED INTO EFFECT Application filed September 6, 1927, Serial No. 217,856, and.' in France September 9, 1926. Renewed February The present invention relates to a method for damping vibrations, which is chiefly applicable to blowpipe apparatus for the cutting of metals.

The idea is already old'of placing a fatty material between two elements movable with respect to one another, either for the purpose of decreasing the wear of the two elements or for the purpose of restraining the relative movement of these elements. 7

It has been found that the interposition of certain fatty materials between the blow pipe carrier and its support in a cutting apparatus, allows the securing of a truly extraordinary uniformity of speed of displacement of the blow ipe carrier upon its support, and it has been ound that the interposed matter should have a certain deformability, doubtless to follow the differences of level of the facing surfaces of tlte blow pipe carrier and its support, and a certain porosity, probably to serve as a reservoir for the fatty material and to maintain between this material and at least one of the elements a liquid layer of fatty material. It has been found that this interposition allows the obtaining of a regularity of out which makes unnecessary a subsequent straightening operation.

It is shown by experience that the interposed substance may consist to advantage of greasy leather, india rubber, or suitable plastic substances which may be substituted for the same, but on the contrary it is observed that asbestos, textile fabrics and felt, even when lubricated, will not offer satisfactory results.

It is found that when the blowpipe is faced with greasy leather or india rubber, the forward motion of the blowpipe holder becomes much slower, and the force required for this purpose must be much greater than if other factors being equal no such facing were employed. However the forward motion of the blow ipe holder becomes very regular, and all vi rations are eliminated.

It is very difficult to give a scientific explanation of this action which has been observed by experience, but the effect might be explained as follows. The aforesaid substances which prove satisfactory are capable of maintaining between the surface of the guide or like portion and the blowpi e holder a thin film of viscous substance wit out leaving any space between these parts so that the surfaces in contact will have a strong adhesion, and an easy sliding upon the lubricant will be obtained.

The following description with reference to the appende drawings which are 'ven by way of example shows various em odiments of the invention.

Fig. l is a view in perspective showing a preferred form of plan view of an apparatus according to the present invention. Fig. 2 is a side view of a facing member. Fig. 3 is a diagrammatic plan view of a modification, and Fig. 4. is a corresponding section on the line IV-IV of Fig. 3. Fig. 5 is a diagrammatic view of a modification in which the propelling effort is transmitted to the blowpipe carrier by means of a spring.

In the example shown in Fig. 1, the blowpipe holder comprises a rod 1 upon which is mounted the blowpipe 3. As in all of the known apparatus, the pointer is disposed upon one of the elements of the pantograph 4. The rod 1 carrying the blowpipe is sup ported at two points by the rigid stationary 1 frame 5. Between the rod 1 and the frame 5 1 are disposed the guides 6 which are faced with leather on their friction surfaces, thus offering a greasy friction whereby all vibrations will be eliminated.

The said facing herein consists as shown in Fig. 2 of two semi-cylindrical members 7 and 8 which are connected together at 9 and are faced in the interior by the leather or india rubber pieces 7 and 8; one of the said members 7 is in contact with one of the uprights of the frame 5, and in the other member 8 is disposed the rod 1. In the present device, the various rods consist of metallic tubes. One to this double facing, the blowpipe 3 may be moved in all directions without any jarring action.

In another construction which is shown in Figs. 3 and 4, the blowpipe holder rests consists of so ments 11 of a pantograph 12, whose pointer is shown at 13. Upon the element 11 (Fig.

.4) is mounted by means of a clam ing collar -1ike: The said .disc 17 is slidable on the smooth surface of the table 19 and serves as a shock-absorbing brake.

In these various cases, I prefer-to propel the blowpipe whether by hand or by mechanical meansthrough the medium of an interposed traction spring." The driving effort on the pantograph 12 or on the'rod 16 is not exercised upon the;blowpipe-carrying element in a. direct manner but through the medium of a spring 21, so that the variations in the driving effort are taken up in the first place by the spring 21 and then by the material 18 which is placed betweenthe disc 17 and the table 19. This improvement forms a valuablefeature, and especially in the case of hand control;

i It should be further noted that my said invention comprises all blowpipe cutting apparatus provided with a brake consisting of a disc which slides by friction upon a smooth lubricated surface. 4

My said method and apparatus may be employed for'darnping or absorbing the vibrations of all movable elements inwhicli all the vibrations are to be eliminated, and as an example, I may mention the various engraving devices which are mounted on a pantagraph sup ort.

aving now particularly described my invention and in what manner the same is to he performed, I claim as my invention: I

1. Cutting apparatus comprising a blow torch, a support, and means for making uniform the speed of motion of the said blow torch relative to'its support, said means consisting of a deformable and porous material placed between said blow torch and its support, and of fatty material filling the pores of said deformable porous material and forming a fatty layer.

- 2. In a cutting apparatus comprising a table, a plate moving on said table, a blowpipe integral with said plate, a fat reservoir placed between said plate and said table, said reservoir being formed of a deformable and porous material.

3. In a cutting apparatus comprising a table, a plate moving on said table, a blow-- pipe integral with said plate, a fat reservoir placed between said plate and said table, said reservoir being formed of a layer of leather.

4. In a cutting apparatus comprising a table, a plate moving on said table, a blow pipe integral with said plate, a fat reservoir placed between said plate and said table, said reservoir being formed of a layer of sheepskin.

nature.

In testimony whereof I have afilxed my sig- Signed at Paris this; 25th day of August,

MAURICE CLAUDE. 

